I think his question is will iTunes (not the replacement, the Music App) be updated. I use an Old Mac Pro (2008) as my music station with it's 24x96 optical out to my stereo. Will iTunes be updated to support 24x96 Apple music files or just continue to support only the downloaded files I have in my library...Is your question about iTunes Store? It seem like it is Apple Music only.
If your question is about ALAC and iTunes, the support for it has been for years. I convert SACD to ALAC to use it in the Apple Music app.
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